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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8366cbe1e8d7c2aa67bb0162d2f607c8e450de2aeb5ccef073766685ea04e10' 
  AND token = 'QtdjkMDyp1kcd93yHlI/STTcbR38VepQRoUA/x6O5Ks=' 
  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"
    }
  }
}