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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96c758e3b177d3a01a5ad3baf231f6cabae70d08bea1e7e576b3e52a594d366' 
  AND token = 'j09qSHNNrr992aPcSQ/FLP/eRqQ0l4ksMZyQa+3NVxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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