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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975cdb4129bbd1682afec3527f16a031f58a727fdf8799289c3809a0cdb3c3b4' 
  AND token = '4O4usz9laEKnWEpZz1MwiVDC8+0Ze8FGX6HxxTA6ONs=' 
  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"
    }
  }
}