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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217ff6f49b2bc8b959774d5a4a7868ce120c70515a3469b978c09df71f3bac10' 
  AND token = 'A1xrpFeTSS18k0o8m2tVw/gQ2FOGdqbXp57uPv5vurE=' 
  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"
    }
  }
}