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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fd3fb7db4278e33c8c677fb57c756b5397849de1506d8dab26cc7cd633cae9' 
  AND token = 'yQJ0qT6LD0gq4dErDpWuxrkZxt6TK57XcATyvdz2h4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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