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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34083f4cdaf6060926589c9513b8b33661af329751d4432f272c1e0f08d9f04' 
  AND token = 'FhUgaEx/ekXd/h0lNZEWppQkE5sE+++TWBaXM3EJqI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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