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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7deb77a59fcacaa796ff09fad946e697c17a8bd09365b4835eeba23d72ec0b15' 
  AND token = 'm8SyKk77hVlO36is+JeDw/UK5IlQXKu+Jm1o0Ctzok4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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