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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca27f69de1d1a5008fe75ad85593a29317894df2d35fb7897a3991c96206c76e' 
  AND token = 'AI9k+86dLvWIoDC1TmdUTaoPKrtyg6J5BQKQPuzUcaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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