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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80df2cac5d177432f9302bd52a163dea39b7247f432121fe3ccf6bb06715691' 
  AND token = '7S1ipWIdT/Jcn3uLkYrKJbwhSDItWA+NMU3Eu1iMBdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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