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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bd92b5016ba224b6342e2a9767d0b5bef16047fb041560588b07924b06ed98' 
  AND token = 'cdWmR4XsAMFlVGrc7tJOoNRT6ADg7hNV5BdcP1QTQbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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