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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce2de54134e662aa84e732db70b57fb5d1046a0a9a71692360c79ff03c6707f' 
  AND token = 'cdUdJVp+FTWoKu/779pcIYpRynI7ugE16SOFFFDFKu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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