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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8bed9c44603fe1a49211d7fb73a225df1f3b820e167a42694505017bc5b753' 
  AND token = 'AFrZNNNhy/fuz785wCG1mbeDeTZU/tmqP23fBh7k8I0=' 
  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"
    }
  }
}