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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec7f7f8444d61f73477fe2f156c543aa1f715b2cbb26a92cee9949def0217c3' 
  AND token = 'yvr5JSVwYSvOHIpa1DLAn987Lusgz0dtmiuu2tK1GL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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