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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea123766fb8873ad6d8763d8c360f08ada55923e2ba529ccd7b4cd5bc46748b' 
  AND token = 'XScWcKEopy+lj+8wzS3JjPWU3s71k8nwBYX5oDoqsYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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