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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40788227a2e9315d0e2acd71803fd7b288fda1ddb775500ea19110119ac34f7f' 
  AND token = '81ZXQW47GlIPKPb+NVr8hbO/d5jej7TzbJJ6Sg1LEVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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