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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a14359e07d0fc50da6a92b0f568a9a40536e44607d2941fc6155a4d59bc4d7a' 
  AND token = 'r5oGSDYsteK4eA0I55NgNnQHI6yuCroX3hL/FExnbpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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