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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb78b041ee1caf4ca18f3456a177f046fa1a677e90a0cfa462f514c51173ac9' 
  AND token = 'Uo8XsXQouhmH+CK5IMImrpWP3sSZILY5q0JoUOP8jPY=' 
  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"
    }
  }
}