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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40918f0646269ad6befcdd9f3862775c8a2e5cfc0789d6b84453630d78be3aac' 
  AND token = '5jmeATwwCRoUQ/udkkGiiaxqt6E3Z3cbf3oL/3qVjak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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