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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1a23105546c5ca61ac2fcaa87ab0665c053f5eda6075abe622c76617b7590f' 
  AND token = '+Df3ogiW4bPu/lzlnZjFN5sA1ajI/w4eRlqm1F91gJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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