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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd58736fff4c476bc0f9635c2489c368a4e63bf877548a94de29373d587466ce' 
  AND token = '0cuuWcZjg4E5d+fDQABcwxNTkm5g4Sr0muOZq7klWb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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