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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec4a77b01ec0353b40b1cd037a2f671324a0f6f75fe9b7e5ff5cc1735dfa113' 
  AND token = '/cEmCtWVC0PpJSl6ZEElI8pJ6Nu9pohXLUCWTYcWnC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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