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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c991852797d61da5e394c2bf9accf7f63037ea1ab69a08960620e57a9c2e5386' 
  AND token = 'oM8YeJT1JKSSmyjDt+LfkwAXP7cJRhsH/AB7CcECFSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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