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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1af3e7d858a1c10c8f0d58b846680aa731e3bb442fbe2f6150d273601f95aa0' 
  AND token = 'RdQfR9Tp6lHv1npVzFvmUo9x77kMQQ9bMCOP09OjEqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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