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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182651ff5ca7580fde29dabc87659a3553c34025047c415570f66037a8a9010b' 
  AND token = 'lNShiT+5bw/YW2g13az71KW4yY1ReZQ0BNanEsZJd4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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