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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495ab33440aa5f6340d2892e5d7d18a88681a49b5d62bd4c8d2c7ec8497c4946' 
  AND token = 'sGqKAxT9RNa5Y+1Ajxdu8EY4pcFy6NKTnM/0QKbMnJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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