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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9f2185c8126e0e797ab99ec168e018dba1c26fc2410509c01f6d3ce1c6b956' 
  AND token = '6uPj92f1OxXDtf6rwIRvCjj81e9sWMpOFac15e2jEP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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