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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1a39dca22f8d2f22267cf2206786f5a302de8146828d21c77fd0ec2862bb5f' 
  AND token = 'RoNzhgYgyotmh4bPTuLHE6cJUzGY6sMp89aIf9Cnz5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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