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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea6e193313c0460bac25218a75d120e46cc5cc0811c123be356df201bb0b384' 
  AND token = 'OxSZnPvCjRTH2OOZtCsz7w4PNV8WjlQuT0X3MHBk4TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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