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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d8cae7b88aa575d222dc3d709db85ed96638081557dda347efeeb8dca8fc7f' 
  AND token = 'g8nv+Nx9S5hYBEpYw9/wBEkaYXFzny7aRbg9fCGwSZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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