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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f6e9ffe5f77821355c2bffee8801f9ec05a182a706b5c00d29a0e0c17fd263' 
  AND token = 'cRouH8iTOkh7pvM49LrF6Xhh4hY60qno1+/EqJayHRg=' 
  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"
    }
  }
}