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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca55aaf8bf185b96dfef83636f69d840210906c6619483cac842d89b148cb25b' 
  AND token = '+GTrit8+0ykJih/flC/ySbzq42daOA0djK7ngQJUbb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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