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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd52d875c15e6ac5f04756e0a356b9ab233abbee5939fb7b4132913194ec82d7' 
  AND token = 'i1xYv1q3iyDVvA5vpBvgDgfJjN3fJ18Ak296ovsr15w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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