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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1858492711e1c5d0d43a48bd2807124446ac840bf84a4f7d08b8e7ba045682' 
  AND token = 'nKZAsMkoQWtXSdR5Po9IR6cbSuh0eavpou/6VPGXZv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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