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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb82bc3a2f1a7b0874051afdcde597fa8bfc7d406a1f6e236e9e0921582df3b' 
  AND token = 'ebSn96svzNo3Pow5tgPKkcIsqOFWtKdZppkylyaxLFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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