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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49a740253de3693310156f6818e3eeac962238379d2729ef9750273c7ab3577' 
  AND token = '4a14TkIJSEFpgy+u8z520BlpRJ1xQ8snpVDnAQz5NII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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