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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41b1fef6836f903f08738ba64322994ef1e1fc7aeac1b8cd1a2ae88e0ec8db6' 
  AND token = 'H49ICsuNSTLkebrFjkgBqSY6dscy4FocCyDWyt8EZVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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