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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e3aabea026781debf6af555f22ec23b4e7c581c5b86b22a4e1d0acedf67379' 
  AND token = 'xrUbOdFd94b/XbEawD+klZKsSVv4WREIlkSKDdc5oMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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