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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd958c8450f957bc05f5e141073d7d5f798f1652525af307a0abdf53b0484ae5' 
  AND token = 'JUn6M8XEpwxmMoi4chXFViT5eVN3Y8KA6UmUfP8VAOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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