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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd739b02573f39403d36c5fe7f948745f682f7798409624c621ae091949ba9f' 
  AND token = '/tXwu7dz8bUQrYp/bnIE56B9MlMsF5g4AlS4gsvCX60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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