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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b39bcc5f00b42a2852b15277161c788d89bdafe7a3b8091562d97d32e31abae' 
  AND token = 'oHZG5NJ4bua8HXx0EifEILYakqoRLPf7amSv4j14sG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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