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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e9853112282d6f367115a0c35bdaac4b9806dcb04602a8dcd664f246f515cc' 
  AND token = 'XaTKPzE7TkkEPCuFEj8w+/aWASzcEd8lONjS4Lb3Hpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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