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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3526753ad7fff12e8cc459ee600eb305c291e1e06b9ec1ca9a7a10037585d7' 
  AND token = 'LnN0OYEZzY0Fb8sp78w8mfobvZNL1RFLo/eS3i0Pgus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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