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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac7a9951960c61bcb890648c2f6dd6b906aa310e02fde95e9bf0edefad92c1c' 
  AND token = 'QwHznfzEk3MPaE/Zuzm5zssPlhR5lw2NPED6lraqMYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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