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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a3bb90fc94bf522a44006c3214468c280898d984095f36f1a0dec4aa3b73ef' 
  AND token = 'r6+4bZp6PO3ITdtb51fjjgvQIr8BqacaZ9fXucPFoTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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