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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953ffb06c2a6ddaa37745e76ec98657c9f66c8f410ec9dd84ed15a125bba13fb' 
  AND token = 'm51iJ24Ow/KVI+XZ4Kc5ZIMITtI3dON6pGdPKy/HW30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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