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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a4bca86917bf53ba5f92a3b725ea28ad7928969611b17cbbb874a078859609' 
  AND token = 'BeyhAxl7p69y2FZqdkoa62RIgZUAYtq/9ZMuKY7sSH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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