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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b9d0f6f521b185f03afe161843705279585848e6c712edeca91992bb0a7747' 
  AND token = 'SIpE3cPk5RnBaoDNff2DTc90YQ1ihB7hZN9zAzf2gSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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