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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7a2d881d9ea05544a5b661986588708fa331eaa571a829db2ce4a81a3e4e0c' 
  AND token = 'HZg0II90uNGlaDQTYwNhgA5l0aUrjojWr09DhsZJDSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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