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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3559087d598f085e629825a888ccd962ab3f46824a9a0b0f5ac4405e7eccd185' 
  AND token = '2bAQPVCCWlNZHu2DGRr64uFIN4G23QgcesGot4nQupQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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