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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b0c45b4c78ac0e52651622abc27f7c3eebcca4703d4b0d82cc4bb08acd1113' 
  AND token = 'Ekr91XB6pFp8OUWJD6/gVBP/4ROBzGHNbKOlEp4Bq7E=' 
  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"
    }
  }
}