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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37fb9d7e76155e9bdc9666b69438e70ecf090ae78e6b501394f369f3a3b2d58' 
  AND token = '9p6EhWOt5N4v7DhfBMC/lC6tu3Pegme0jUNQt7+FlEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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