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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fea27e6a8ea26b63fa5b5f6d2dfaa1acaae0b203c8267607edf29e3eefbbca' 
  AND token = 'Wzm92Bya9TdfLIDv6T1X4OeA1hhyLfO3EzB7gPQnpXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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