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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edb74ed0823ad3257d95c680f4423dd1eee83f9694e90c555ccfadb6b9b62e4' 
  AND token = 'x893VbHv/tzTsK4yGebPrhO6ISwECq3Ynshl5SerWYY=' 
  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"
    }
  }
}