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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725969be698e75516bd7897a103c3f677b3aaa18892b4809507c52ab3923dea4' 
  AND token = '5bU3kJgSaPY+Hqje/W/3QiIHg7qniN7O4twGrNovyuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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