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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca93fff923f56352235b7a238a56149614a8446378dbf9c286889c4782a24081' 
  AND token = 'mhmJTdRn8qVWoMOJSZ2v0X98ZkdBo59QDSo8MeB64mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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