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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8415d7d042df357a2386d00119606cf11e2863720aa58b01ed26b6db557a2bd' 
  AND token = 'dDVYiAPkhZl+DlkTziYPNg7y3jPe9lD/kV0Fgw+yRtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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