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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87e7bdc245af16c1a1ea909d7f1841b3af9cad559e0c06f5a92a107ab896ee1' 
  AND token = 'Afco8y39iisHuUHPsNSnHxtV8UFd2VZDv3H9RXOi38s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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