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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6727a65b653ea26831cf0cb260e982d695c67f9723ca6388ad75b8bb1d702bf3' 
  AND token = 'U3vY75vypIJg3HkKGuR2szipcHLa88L+tEEnyNqxX5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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