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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ccea24047096386a05e34bf3cd3cda10759544e5384f41b2c4ddfb006c9732' 
  AND token = '/zIE2+jESNkvar6umcTHKHA5YLgNvPf+z40lmy9QEms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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