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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb52d8470094f0a216b9736b95f32ed56c03c0547b109e70688edd9ff1b89e3' 
  AND token = '+9xzGeeKVe7tOKxB0b/XQwZpI47v7EhvHfs1A5Ezm0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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