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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8a33c54e729989970fa8950f75e2e47b0ff43d3d52cf9b787d23c478aadc55' 
  AND token = 'Z+XY1sZjiQwgUFjdwJyM6aKNs/o6OH2M938b03wGbmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}