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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4393a294ca57b1b6e01663c9c8ccff61b5cdc19dea4a52076a6cc37af3921944' 
  AND token = 'O+idqR7UM8cbxIle4WBnuCOMHIb5WLPVlex1GwuBpJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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