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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5865cfcb0e9b96b13bc947c680ac7bc4b12c976d33823770ba553f59e0b92d59' 
  AND token = 'ldYmMW4mzFtnOamEsZ0POqkolJSIhCFMz/dljXo42Fc=' 
  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"
    }
  }
}