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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7167a917ef73ceb9954d59a77b6c296ced5e6c2090762b6dad9c4eee5726c4' 
  AND token = 'wLSlLdQMnuqgcV9jS0gKxdI+77+yiJz+fL0xn51ciZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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